React hangs when trying to connect to component

For some reason, when trying to connect this component, react simply hangs without giving any error: import React, { useState, useEffect } from ‘react’; import { useHttp } from ‘../../hooks/http.hooks’…

How do I transform the results of a Lodash groupBy in a _.chain

I have the following array: [ { user: 5fde62aa0cec1598fda103ac, feeling: ‘positive’ }, { user: 5fde62a10cec1598fd9f9222, feeling: ‘indifferent’ }, { user: 5fde62aa0cec1598fda103ac, feeling: ‘…

Remove duplicates from array of objects conditionally

I’ve got an array of objects which have a property in common ‘label’. But some of them have properties that others don’t : const array = [ { label: ‘thing’, type: ‘reg’, }, …

use lodash convert one JSON structure to another

I have a json JSON structure like this var data = [ { “S1”: “$13”, “S3B/T1”: “$15”, “S3B-N/SS-GG”: “$17”, …

Unexpected token ‘export’ in lodash-es

I move from lodash to lodash-es in my typescript project . I installed lodash-es and @types/lodash-es. But when I compile using webpack my project it throw an error: C:..node_moduleslodash-es…

Checking ‘undefined’ or ‘null’ of any Object

I am working on Angular project and time to time I used to have check undefined or null over Object or it’s properties. Normally I use lodash _.isUndefined() see example below: I couldn’t see any problem with it. But I had discussion with my colleague during review of above code. He was telling me that if i gets undefined before the if statement then it will throw the exception. Instead he suggested me to always check i or i.id like this: I am convinced what he was trying to say unlike his way of checking undefined in above code. But

Nested grouping in array of objects with id and date?

I have an array of json objects as Now i want to group data for same accountid for a year. For example Please guide me how can achieve this ? Answer Use forEach over items and Build an object with keys and accountId (have separate buckets for each month). Get Object.values from the object just built.

How to merge two objects, overriding null values?

I’d like to merge two similar but not identical objects and override null values in one of them, if such exist. For example I’d have these two objects: And the effect of merge should be: In other words, the most important source of data in the merged object is obj2 but it lacks some properties from obj1, so they need to be copied and also some of the obj2 values are null so they should be taken from obj1 as well. EDIT I tried: and Answer You can use _.mergeWith(), and in the merge callback only take the 2nd value

javascript implementation of lodash “set” method

Found this excellent code for _.get vanilla js implementation: const get = (obj, path, defaultValue) => path.split(“.”) .reduce((a, c) => (a && a[c] ? a[c] : (defaultValue || null)), …

Add new property to object collection based on condition with lodash

I have an array of objects as such: var data = [{ a: 1 }, { a: 1 }, { a: 2 }, { a: 2 }]; How can I create, with lodash, a new array just like data but for which we …